The effectiveness of subliminal messages has been thoroughly questioned by scientists and psychologists alike. The reason could be the blatant fabrication of the 1957 study of James Vicary, which claimed that showing subliminal messages have induced people to buy more coke and popcorn. His study was not scientific and never replicated properly. In 1962, Vicary himself admitted that the studies were a fabrication. This probably led to prejudice against the applicability of subliminal stimuli. But recent studies have shown that subliminal stimuli do elicit responses from your brain even if you yourself are not aware of the message and haven't consciously perceived it.
In 2005, a study was published in the scientific journal, Proceedings of the National Academy of Sciences, in which it was reported that subliminal messages are unconsciously processed by people who are subjected to it. For the purpose of the study the scientists studied epileptic patients who had electrodes (which record brain activity) placed in their brain. They were given both subliminal and non subliminal messages, both containing words that were neutral and words that induce fear.
It was found that the subliminal messages triggered activity in the same areas of the brain which get triggered when a supraliminal stimulus (which could be perceived by conscious brain) is received. The fear message in subliminal stimuli elicited response from the fear center of the brain called amygdala. The same center responded when the patients were subjected to supraliminal stimulus containing the fear inducing word.
Even earlier, in the 1970's British Psychologist Antony Marcel conducted a study involving subliminal words. Marcel found that even when words were provided in a way which made it impossible for the subject to perceive it, the words still affected the subject's subsequent decisions. After that there have been other studies on Marcel's work which used subliminal messages and confirmed that there indeed is an effect.
The problem with scientific studies, which have disprove subliminal messages, is that these studies are conducted based on single exposure rather than multiple exposures. Even in the case of conscious learning processes a message or fact need to be repetitively given for someone to grasp it. It should be the same with subliminal stimuli. But most of the studies which discredited subliminal stimuli either ignored or probably were not aware of this fact.
There have been no scientific studies done to show the extent of effectiveness of subliminal messages. Hence their extraordinary capabilities are still open to question. Yet, many studies have proven that brain does indeed react to subliminal stimuli. Also there is a lot of circumstantial evidence as well as personal statements which attest to the effectiveness of subliminal messaging.
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